Olivier Fourdan 60800d2313 renderer-native: Separate offscreen and shadowfb
Create the intermediate shadow framebuffer for use exclusively when a
shadowfb is required.

Keep the previous offscreen framebuffer is as an intermediate
framebuffer for transformations only.

This way, we can apply transformations between in-memory framebuffers
prior to blit the result to screen, and achieve acceptable performance
even with software rendering on discrete GPU.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/877
2019-11-04 10:44:42 +01:00
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